diff --git a/configuration.nix b/configuration.nix
index e90a513..83277d9 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -6,6 +6,12 @@
     auto-optimise-store = true;
   };
 
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
   environment.systemPackages = with pkgs; [
     kitty.terminfo
     kakoune